For the most part, I haven't had too many problems with new upgrade causing any app or phone failures, but as always they add more useless apps. Anyone want to pay $2.99 a month for Caller Name ID? I thought I was paying for that already! They added more "Knox" apps. Now there is KNOX II, KNOX Store, KNOX SetupWizardClient & KNOX MigrationAgent. (Is there anyone out there who uses KNOX & could they explain it to me?) There's something called "Mobile TV", "Music FX", "Travel", "Travel Wallpaper" etc. When I look at some of them, they have more permissions, flags & certifications than most system apps! They moved the "import/export" contacts from the contact app & hid it under the phone app. (I download my contacts to my SD card -- long story). I miss being able to turn on my mobile data with an app. I, too, hate having the favorites list automatically calling the person; instead of displaying their information. I have an odd problem with the update, when I play my music, it will say that it doesn't support that format but it plays anyway! I have several gripes about the lock screen. I miss the lock screen apps page. I hate that it shows that I have a message & I can't press on that display to take me to the message app. Maybe it has something to do with "driver safety". If you make people push enough buttons, it will discourage them from texting, oh wait a second; they'll have to press more buttons creating even more crashes! ...BUT the #1 gripe I have, is the lock screen's display. Now the time, date, personal message display is smaller & not centered anymore. If there are any "messages" on the notification bar, it's displayed on the lock screen in huge, white bars.Then the time & date are pushed to the top of the screen, made even smaller & the personal message disappears. I wear glasses & I didn't need to use my glasses to see the time on the old lock screen. I don't think it's that important to display that I have updates to apps on the lock screen, I downloaded an app, or I set my alarm clock! Actually, I downloaded an alarm clock app that gives me the ability to set multiple alarms for different times & days. I rely on this app. Now, I have to turn it off & on so I don't have the stupid message bar on the lock screen; which in turn makes the alarm clock useless!